Oracle 10g JDev IDE 9.0.5.2 Null Pointer Exception while debugging

Question

Hi,
In windows XP m/c, I am facing following Null Pointer
Exception while debugging basic Java application through
10g JDev 9.0.5.2, and it failed in debugging that application...
May I know, How to get it out of this problem..., am
suspecting Is it related to any of my windows XP configuration?
Here's the stack trace shown in the 10g JDev console while
debugging simple java application..,
java.lang.NullPointerException
at javax.swing.border.EmptyBorder.<init>(EmptyBorder.java:54)
at com.sun.java.swing.plaf.windows.WindowsTableHeaderUI$XPDefaultRendere
r.getTableCellRendererComponent(WindowsTableHeaderUI.java:63)
at oracle.jdevimpl.runner.debug.ThreadsPanel$3.getTableCellRendererCompo
nent(ThreadsPanel.java:306)
at javax.swing.plaf.basic.BasicTableHeaderUI.getHeaderRenderer(BasicTabl
eHeaderUI.java:394)
at javax.swing.plaf.basic.BasicTableHeaderUI.getHeaderHeight(BasicTableH
eaderUI.java:428)
at javax.swing.plaf.basic.BasicTableHeaderUI.createHeaderSize(BasicTable
HeaderUI.java:454)
at javax.swing.plaf.basic.BasicTableHeaderUI.getPreferredSize(BasicTable
HeaderUI.java:485)
at javax.swing.JComponent.getPreferredSize(JComponent.java:1275)
at oracle.jdevimpl.runner.debug.ThreadsPanel.threadsPanelSettingsChanged
(ThreadsPanel.java:538)
at oracle.jdevimpl.runner.debug.ThreadsWindow$AllThreadsPanel.threadsWin
dowSettingsChanged(ThreadsWindow.java:408)
at oracle.jdevimpl.runner.debug.ThreadsWindow.threadsWindowSettingsChang
ed(ThreadsWindow.java:138)
at oracle.jdevimpl.runner.debug.ThreadsWindow.<init>(ThreadsWindow.java:
112)
at oracle.jdevimpl.runner.debug.JDebugger.getThreadsWindow(JDebugger.jav
a:3048)
at oracle.jdevimpl.runner.debug.DebuggingProcess.selected(DebuggingProce
ss.java:565)
at oracle.ideimpl.runner.RunManager.viewSelectionChanged(RunManager.java
:467)
at oracle.ide.addin.AbstractView.fireViewSelectionChanged(AbstractView.j
ava:484)
at oracle.ideri.navigator.DefaultNavigatorWindow.fireViewSelectionChange
d(DefaultNavigatorWindow.java:791)
at oracle.ideri.navigator.DefaultNavigatorWindow$3.viewSelectionChanged(
DefaultNavigatorWindow.java:1218)
at oracle.ide.addin.AbstractView.fireViewSelectionChanged(AbstractView.j
ava:484)
at oracle.ideimpl.explorer.BaseTreeExplorer.actionPerformed(BaseTreeExpl
orer.java:2077)
at javax.swing.Timer.fireActionPerformed(Timer.java:271)
at javax.swing.Timer$DoPostEvent.run(Timer.java:201)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:178)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:454)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchTh

Answer 1

John,
You mentioned "I closed the IDE so that the TopLink project would pick up the changes..."
1. We need to find out why you needed to close the IDE? Was TopLink mapping editor not picking up your changes?
2. I am sure you did not modified .java outside of Jdev, but in case if you did, let me know.
3. After removing a superclass attribute, did you save all changes?
4. We tried various combinations, but were unable to reproduce the project reopen issue that you mentioned was fixed by changing the ClassDescriptor.xml. It would be extremely helpful if you could either send us (anuj dot k dot jain at oracle dot com) a project that can reproduce this issue, or outline the exact steps.